American football is a sport team which was born in the USA . The National Football League was the professional league with more audience .The football championship are held in various parts of the world .In the USA it has been in the National Football League since 1922 .In the United States spread rugby that originated from the American Football .In 1880 Whalter Camp introduced the grid for the start of each game.

Matches are played by two teams with eleven players head . The most important role is played by the quarterback with its launches should

help the team win .The games lasts 60 minutes divided into four times 15 minutes each .

The range consist of 2 doors that are located at the ends of the playing field .The lines which indicate Yards are arranged transversely to the field and

the ball used is oval .

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The aim of the game is to conquer the territory : advancig on several occasions on the lines players must reach the goal of opponents, put the ball and score the touchdown . The ultimate goal is to achieve more points than the opposing team .Points can be scored by players in attack by kicking the ball over the end zone between the two poles that mark the goal (field goal ) . Even the defenders can achive points , blocking the movements of opponents in their area of half or bringing the ball into touchdowns .The Kick-off is done at the beginning of the two times and after each signature .Attempts to reach the goal are called «downs» .The beginning of the action is when the ball is passed from the center to the quarterback . The ball can move in two ways , led by a player in the running or launched forward with a pass .

Roles

1.Center : he is the player who is at the center of the line of attack and that puts the ball in play .2. Quarterback : he gives the order to start action and coordinates the team play on offense .3.Tight end : he receives the lauches and blocks opponents .4.Running back : he starts from behind the line of attack whit the ball .5. Wide receiver : he must receive steps away and anticipate the offensive action of the opponents .

Attack :

1. Defensive Tackle : he stops the race opponents .2. Linebacker : he follows and blocks the action of running , defends

the steps of opponents and disrupts the action of launch.3. Cornerback : he defends the outer sides of the field from the steps of

the opponent .4. Free Safety : he follows the receiver opponents and plate them .

Defence :

Football Girls

The football girls is practiced at a competive level in the United States and other countries . In some cases , players have been included in the men’s team particulary in the US Collegiate Championships .HISTORY :The first championship since 1965 when the Women's Professional Football League was founded.The highest-rated North America league is now the Independent Women’s Football League , founded in 2000, with teams in the United States of America and Canada .